You'll be better off by just rebuilding the kernel again.

Do this:

cp .config /tmp/dot_config
make mrproper
cp /tmp/dot_config .config

## edit Makefile by hand and change the EXTRAVERSION line
## at the top to something unique for this build.

make oldconfig
make dep clean bzImage modules modules_install

And install the kernel ("make install" ?) whatever way you normally do.
After reboot, do "uname -r" and verify that the EXTRAVERSION tag is present.

Cheers